B. Because even with many issues that plagued the Roman Empire economically and politically, By the later years of the empire the Roman military was mainly comprised of trained Barbarian soliders who were inferior to earlier Roman soliders causing a significant decrease in the Roman Empires's Military capablities so many barbarian tribes that began to grow such as the Huns, Vandals, Goth etc. Put immense pressure on the Empire, driving them into the ground economically and causing many issues within the government and eventually being sacked, thus marking the end of the Roman Empire. Sorry for the wall of text but hope this helped :)
World War I. It lasted from July 1914 until November 1918.
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the growth of cities.
Explanation:
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Einstein's two postulates of special relativity are as follows, 1. The principle of relativity: The laws of physics are the same in all inertial systems. ... The constancy of the speed of light: Observers in all inertial systems mea- sure the same value for the speed of light in a vacuum.
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History tells us that World War II ended with a relentless Allied leap from island-to-island across the Pacific, culminating with the fire-bombing of Tokyo. The atomic bombs on Hiroshima and Nagasaki, we are told, delivered the final blow, immediately bringing the Japanese to their knees.
Explanation: